Hydraulic strcutures document View

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Greenwood Village Drainage Criteria Manual

October 2003 Chapter 12.0, Hydraulic Structures Page 2

12.2.2 Hydraulic Drop Structures

Reducing the channel invert slope using hydraulic drop structures is a common method of

controlling flow velocity. Design of hydraulic drop structures shall be in accordance with the

criteria presented in the Hydraulic Structures Chapter, Volume 2 of the UDFCD Drainage

Criteria Manual.

The Village strongly encourages the use of boulder designs for drop structures. Typical designs

for boulder drop structures are shown in Figures 12-1 and 12-2. Typical grouted boulder designs

are shown in Figure 12-3. These designs are more adaptable to the parks, recreation, and trail

usage of the Major Drainageways in the Village. The Village also strongly encourages designs

which rely on larger boulders rather than the use of grout to provide the structural stability.

12.2.3 Bridges

Bridge hydraulic design shall be in accordance with the criteria presented in the HydraulicStructures Chapter, Volume 2 of the UDFCD Drainage Criteria Manual.

Bridge hydraulic capacity shall be designed in accordance with the following criteria:

1) Flow through the bridge constriction shall be modeled using backwater analysis toestablish the water surface profile.

2) The Village prohibits supercritical flow through bridge openings. For sub-criticalflow, the low chord of the bridge shall be a minimum of one foot above the 100-year

water surface elevation or the energy grade line, whichever is greater.

3) Maximum allowable velocities shall be consistent with the constraints of the

abutment lining material and the potential for scour. The Village recommends thatvelocities not exceed 18 fps.

12.2.4 Transitions, Bends, and Confluences

The design of hydraulic structures as erosion protection for transitions, bends, and confluences

shall be in accordance with the criteria presented in the Hydraulic Structures Chapter, Volume 2

of the UDFCD Drainage Criteria Manual.

12.2.5 Crossings and Discharges into Irrigation Ditches

The Village is divided by the Highline Canal, which crosses Greenwood Gulch, Prentice Gulch,

and Little Dry Creek within the Village boundaries, as shown in Figure 2-2. The Highline Canal

is owned and operated by the Denver Board of Water Commissioners (Denver Water Board).

Documentation of approval by the Denver Water Board is required for any discharges into the

Highline Canal. By a separate document, the applicant shall indemnify the Village for any claims

against the Village as a result of activities of the applicant adjacent to the Highline Canal.


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Insert Figures 12-1 through 12-3.


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12.0 HYDRAULIC STRUCTURES.....................................................................................................................1

12.1 INTRODUCTION............................................................................................................................................1

12.2 TYPES OF HYDRAULIC STRUCTURES ...........................................................................................................1

12.2.1 Conduit Outlet Structures .................................................................................................................1

12.2.2 Hydraulic Drop Structures......... .......... ........... ........... .......... ........... ........... .......... ........... .......... ........2

12.2.3 Bridges .......... ........... .......... ........... ........... .......... ........... ........... .......... ........... ........... .......... .......... .....2

12.2.4 Transitions, Bends, and Confluences ................................................................................................2

12.2.5 Crossings and Discharges into Irrigation Ditches............................................................................2


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